Hanger-Rod Stiffeners: When the Rod Needs Lateral Support

Does this hanger rod require a stiffener under the approved detail, and which stiffener attachment applies here?

Seismic Bracing & Structural Coordination 1st Year RED

Stop if

Stop and verify the approved detail, responsible trade, or authority before work proceeds.

Watch out

Do not add random strut or wire as a substitute, guess the trigger length, or clamp a stiffener where it can damage the rod or duct.

Check

room/grid/area
photo of the condition
current drawing/detail/submittal
measurements or test information
what has already been checked

Say this to your foreman

hanger-rod stiffeners: when the rod needs lateral support seismic bracing, sway control & structural coordination hanger rod stiffener allthread buckling lateral support seismic use rod stiffeners only where the approved seismic or support detail requires them, and match the rod, stiffener, attachment, length, and orientation to that detail. an unsupported long rod can bend or buckle under lateral load even when its vertical load looks acceptable. approved seismic package, engineered support detail, restraint manufacturer instructions, engineer/foreman direction does this hanger rod require a stiffener under the approved detail, and which stiffener attachment applies here?

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